167 free calculators Β· Vet-reviewed Β· No signupFree Pet & Animal Calculators
Free Pet & Animal Calculators
Science-backed. Vet-reviewed.
FurCalc is a free library of 167+ calculators for dog, cat, aquarium, horse, reptile, bird and livestock owners. Every formula cites a primary source β AAFCO, NRC, AKC, the Merck Veterinary Manual, and peer-reviewed research β and health-impact tools are reviewed by a licensed DVM.
Last updated Β· Maintained by the FurCalc Editorial Team
Vet-reviewed formulasLoads in < 1 secondπ No signup Β· No tracking
What is FurCalc and who is it for?
FurCalc is a free online library of 167+ pet and animal calculators built for everyday pet parents, breeders, vet techs, hobby aquarists and livestock keepers. Each tool answers a single, concrete question β βHow many calories does my 28Β lb spayed Labrador need?β, βIs 6Β oz of milk chocolate toxic to a 15Β kg dog?β, βWhat size tank does an adult ball python need?β β using the exact equation published in veterinary or husbandry literature. There are no accounts, no paywalls, and no data leaves your browser.
If you want a one-screen answer with the math shown, FurCalc is the right tool. If you need a clinical diagnosis or a treatment plan, call your veterinarian β calculators support decisions, they do not replace them.
Which calculator do you need today?
Pick a species below. Each calculator is explained in plain English with the original scientific source cited under the result.
Dog Calculators
View all dogs tools β- Dog Age CalculatorConvert your dog's age to human years using three vet-backed formulas: AKC breed-size, UCSD epigenetic clock, and the classic 7Γ rule.Open calculator
- Dog Pregnancy CalculatorCalculate your dog's due date (63 days from mating) and get an interactive week-by-week pregnancy tracker with vet milestones.Try this tool
- Dog Gestation CalculatorBreeder-focused dog gestation calculator with progesterone timing, ovulation-based due date, whelping temperature drop and litter size estimate.Run the numbers
- Chocolate Toxicity CalculatorIs chocolate dangerous for your dog? This calculator estimates theobromine toxicity by dog weight and chocolate type. One-tap ASPCA poison control.Calculate now
- Puppy Weight CalculatorPredict your puppy's adult weight using 4 methods (double-at-4, growth-curve, breed average, puppy-weeks formula) with visual growth chart.Use this calculator
- Dog Calorie CalculatorCalculate daily calories your dog needs using the NRC/AAFCO RERΓDER formula. Adjusts for life stage, activity, neuter status and weight goal.Get instant result
- Dog Water Intake CalculatorCalculate how many ounces/mL of water your dog should drink per day based on weight, activity and climate. Dehydration warning signs included.Open calculator
- Dog Ideal Weight CalculatorFind your dog's ideal body weight based on breed and body-condition score (BCS). Get a safe weight-loss plan with weekly targets.Try this tool
- Dog Crate Size CalculatorCalculate the correct crate size for your dog using length and height. Covers standard crate sizes (22, 24, 30, 36, 42, 48 inch) with breed examples.Run the numbers
- Dog Benadryl Dosage CalculatorCalculate the safe diphenhydramine (Benadryl) dose for your dog β 1 mg per pound, up to three times daily. Vet-verified thresholds.Calculate now
- Raw Food CalculatorCalculate daily raw-food portion for your dog using the BARF model (2β3 % of body weight) with breakdowns for muscle meat, organs and bone.Use this calculator
- Dog Heat Cycle CalculatorTrack your dog's heat cycle (proestrus β estrus β diestrus β anestrus) and predict the fertile breeding window.Get instant result
- Dog Dewormer Dosage CalculatorCalculate the correct dewormer dose for your dog by weight. Supports fenbendazole, pyrantel pamoate and praziquantel β with vet-approved thresholds.Open calculator
- Dog Life Expectancy CalculatorEstimate your dog's expected lifespan based on breed, size, neuter status and lifestyle. Based on AKC and VetCompass data.Try this tool
- Dog Insulin Dosage CalculatorCalculate starting insulin dose for diabetic dogs using AAHA guideline (0.25 U/kg BID, rounded to whole units). Supports Vetsulin, NPH, Levemir.Run the numbers
- Dog Collar Size CalculatorFind the correct collar size for your dog by neck circumference. Converts inches to XS/S/M/L/XL and includes adjustable range suggestions.Calculate now
- Dog Harness Size CalculatorCalculate the right harness size by chest girth and neck. Supports all major harness brands with unified size conversion.Use this calculator
- Flea/Tick Size PickerSelect the correct size of major flea/tick preventives (NexGard, Bravecto, Frontline Plus, K9 Advantix II) for your dog by weight.Get instant result
- Dog Exercise CalculatorCalculate the recommended daily exercise minutes for your dog based on breed energy level, age and weight. Huskies vs Shih Tzus need very different amounts.Open calculator
- Breed Size PredictorPredict a mixed-breed dog's adult size from paw measurement and current age. Useful for rescue puppies with unknown parentage.Try this tool
- Dog Food ConverterConvert between cups and kcal across 20+ dog food brands. Critical for switching foods without calorie miscount.Run the numbers
- Grape Toxicity CalculatorCheck if your dog ate a dangerous amount of grapes or raisins. Based on 2024 tartaric acid research. One-tap ASPCA poison control.Calculate now
- Xylitol Toxicity CalculatorCalculate xylitol toxicity risk by dog weight and amount ingested. Thresholds: 0.1 g/kg (hypoglycemia), 0.5 g/kg (liver failure).Use this calculator
- Ibuprofen Toxicity CalculatorAssess the risk if your dog ate ibuprofen, naproxen or other NSAIDs. Thresholds: 50 mg/kg (GI), 175 mg/kg (kidney), 400+ mg/kg (CNS).Get instant result
- Vaccine Schedule CalculatorGenerate a personalized puppy vaccination schedule based on date of birth following AAHA 2022 core and non-core vaccine guidelines.Open calculator
- Dog CPR CalculatorEmergency reference for canine CPR: 100β120 compressions/min, 30:2 compression-to-breath ratio. Depth by chest width (1/3 to 1/2).Try this tool
- Puppy Feeding ChartHow much should I feed my puppy? Calculate daily cups by puppy age (weeks to 12 months), expected adult weight and breed size. AAFCO puppy growth formula.Run the numbers
- Dog Teeth Age EstimatorEstimate your dog's age using tooth eruption, wear and tartar. Based on USDA APHIS and Merck Veterinary Manual dental-development charts.Calculate now
- Weight Loss Plan CalculatorCreate a safe, veterinarian-approved weight-loss plan for your overweight dog. Weekly kcal target at 80% RER of ideal weight, timeline, and body-condition milestones.Use this calculator
- Dog Walking Pace CalculatorCalculate dog walking distance (miles or km) from time and pace. Suggests healthy pace by breed, age and weight.Get instant result
- Dog Dental Cleaning ScheduleHow often does your dog need professional dental cleaning? Based on AAHA 2019 guidelines and breed-specific periodontal disease risk.Open calculator
- Dog Boarding Cost CalculatorEstimate boarding cost by days, service type (kennel, luxury hotel, in-home sitter) and location tier. US national averages.Try this tool
- Pet Insurance Cost CalculatorEstimate monthly pet insurance premium for your dog or cat based on species, age, breed and coverage type (accident-only vs accident + illness). 2024 US averages.Run the numbers
- Puppy Potty ScheduleHow often does a puppy need to pee? Bladder-hold rule: 1 hour per month of age + 1 (max 8). Auto-generates a training schedule for your puppy's day.Calculate now
- Labrador Calorie CalculatorCalculate daily calories for your Labrador Retriever. Labs gain weight easily β 25-30% lower calorie multiplier vs average breeds. Based on Kealy 2002 landmark study.Use this calculator
- Golden Retriever CalorieDaily calorie needs for Golden Retrievers. Goldens have higher cancer risk β lean body condition extends lifespan by 1-2 years.Get instant result
- German Shepherd CalorieDaily calories for German Shepherds. GSDs need slightly more protein + joint support due to dysplasia risk.Open calculator
- French Bulldog CalorieDaily calories for Frenchies. Brachycephalic breed β lower activity, very prone to obesity. Lean condition critical for respiratory health.Try this tool
- Pitbull Calorie CalculatorDaily calorie needs for American Pit Bull Terrier / AmStaff. Muscular, athletic breed β activity multiplier often higher than typical.Run the numbers
- Rottweiler CalorieCalories for Rottweilers. Giant breed β calcium & puppy kcal critical to prevent orthopedic disease.Calculate now
- Husky CalorieCalories for Siberian Huskies. Surprisingly efficient metabolism β 20% fewer calories than similar-sized breeds, despite high activity.Use this calculator
- Great Dane CalorieCalories for Great Danes. Giant breed with short lifespan β controlled growth in puppies, lean adult condition.Get instant result
- Chihuahua CalorieDaily calories for Chihuahuas. Toy breed prone to hypoglycemia β frequent meals essential, especially for puppies.Open calculator
- Pug CalorieCalories for Pugs. Brachycephalic + low activity β lean condition is life-saving for airway and joints.Try this tool
- Labrador Puppy Weight ChartMonth-by-month expected weight for Labrador puppies. Males 55-80 lb adult; females 55-70 lb. Flag if under/over expected range.Run the numbers
- Golden Puppy WeightGolden Retriever puppy growth chart. Males 65-75 lb adult; females 55-65 lb. Avoid overfeeding to protect joints.Calculate now
- GSD Puppy WeightGerman Shepherd puppy month-by-month growth. Males 65-90 lb adult; females 50-70 lb. Large breed β controlled growth critical.Use this calculator
- Frenchie Puppy WeightFrench Bulldog puppy growth chart. 17-28 lb adult; reaches ~90% of adult weight by 9 months.Get instant result
- Pitbull Puppy WeightAmerican Pit Bull Terrier / AmStaff puppy growth chart. Males 35-65 lb; females 30-55 lb. Reaches adult weight 12-18 months.Open calculator
- Great Dane Life ExpectancyEstimate lifespan for Great Danes: 7-10 years average. Harlequin and Merle genetics; GDV/bloat prevention; cardiac screening.Try this tool
- Border Collie ExerciseBorder Collies need 2+ hours of combined physical + mental exercise daily. Under-exercised: destructive behavior and OCD.Run the numbers
- Husky ExerciseHuskies need 90-120 min vigorous exercise daily. Without it: howling, escape attempts, destruction. Canicross and skijoring ideal.Calculate now
- Bulldog Heat ToleranceBulldogs are extremely heat-intolerant. Calculator flags unsafe temperatures + max exercise duration. Brachycephalic airway emergency guide.Use this calculator
- Labrador Life ExpectancyLabrador lifespan estimate. Lean Labs (Kealy 2002 study) live 1.8 years longer than overweight littermates. Color genetics, cancer risk.Get instant result
- Dog Treat CalorieTreats β€10% of daily calories. Calculate your dog's max treat calories + brand conversions (Milk-Bone, Zuke's, jerky).Open calculator
- Dog Cone SizeCorrect e-collar/cone size for post-surgery. Measured collar to tip of nose. Alternative options listed.Try this tool
- Dog Grooming FrequencyHow often to groom by coat type: smooth, double, curly, wire, long. Poodles: every 4-6 weeks.Run the numbers
- Pet Age Multi-SpeciesConvert ANY pet's age to human years β dog, cat, rabbit, hamster, horse, guinea pig, parrot.Calculate now
- Kibble Price Per CalorieCompare dog food brands by true cost per 1,000 kcal β the only fair metric. Side-by-side 2-4 brands + annual cost delta.Use this calculator
- Dog Insurance CostRealistic monthly and 10-year pet insurance estimates by breed, age, state, plan type and deductible. Based on NAIC filings and NAPHIA 2024 industry data.Get instant result
- Mixed-Breed Size PredictorPredict your mutt's adult weight using current weight, age, paw size and bone structure. Size category plus similar breeds. No parent breed required.Open calculator
Cat Calculators
View all cats tools β- Cat Age CalculatorConvert your cat's age to human years using the official AAHA/AVMA Feline Life Stage Guidelines. Indoor vs outdoor lifespan compare.Open calculator
- Cat Pregnancy CalculatorEstimate your queen cat's due date (63β67 day gestation) with a weekly tracker, vet milestones and kittening-box prep timing.Try this tool
- Cat Calorie CalculatorCalculate daily kcal for your cat using the RER formula with neutered/intact, kitten, senior and BCS adjustments. AAFP life-stage based.Run the numbers
- Cat Litter CalculatorCalculate how much cat litter you need per month for 1β5 cats. Supports clay, clumping, crystal and pine substrates.Calculate now
- Cat Water Intake CalculatorCalculate your cat's daily water needs based on weight and diet (wet vs dry). Dehydration warning signs and prevention tips.Use this calculator
- Kitten Weight ChartCheck if your kitten's weight is on track. Shows expected weight by age in weeks from birth to 12 months with flags for underweight/overweight.Get instant result
- Cat Dewormer Dosage CalculatorCalculate the correct dewormer dose for cats by weight. Supports pyrantel pamoate, praziquantel and fenbendazole.Open calculator
- Cat Carrier Size CalculatorSize your cat's carrier correctly. Meets IATA pet travel requirements: cat must stand, turn and lie down. Airline cabin-size filtering.Try this tool
- Cat Insulin Dosage CalculatorCalculate starting insulin dose for diabetic cats. AAHA guideline: 0.25 U/kg BID glargine or PZI, rounded down.Run the numbers
- Onion/Garlic Toxicity CalculatorAssess the risk if your cat ate onion, garlic, leek or chive. Cats are 3-5Γ more sensitive than dogs; even small amounts cause Heinz-body anemia.Calculate now
- Acetaminophen Toxicity (Cat)Cat Tylenol toxicity calculator. NO safe dose in cats β 10 mg/kg can cause methemoglobinemia. Emergency contact included.Use this calculator
- Cat Weight ChartCheck your cat's weight against age-based expected ranges from kitten (oz) through adult and senior (lb). Breed-adjusted charts.Get instant result
- Spay/Neuter Recovery TrackerTrack your cat's recovery after spay/neuter surgery with a day-by-day timeline. When to remove cone, expected healing milestones, red-flag warning signs.Open calculator
- Maine Coon Weight ChartMaine Coon growth chart month-by-month. Largest domestic cat breed β males 15-25 lb, females 10-15 lb. Fully grown at 3-5 years (later than most breeds).Try this tool
- Siamese Weight ChartSiamese cat weight chart. Slender active breed β males 8-10 lb, females 6-8 lb. Common misdiagnosis: 'underweight' because of slim build.Run the numbers
- Ragdoll Weight ChartRagdoll cat growth chart. Large breed β males 15-20 lb, females 10-15 lb. Slow maturity: fully grown at 4 years.Calculate now
- Persian Weight ChartPersian cat weight chart. Medium breed 7-12 lb. Prone to weight gain due to low activity; brachycephalic airway requires lean condition.Use this calculator
- Bengal ExerciseBengal cats need 30-60 min active play + climbing + puzzle feeders. Highest-activity domestic cat breed β ignoring enrichment causes behavioral problems.Get instant result
- Kitten Vaccine ScheduleGenerate kitten vaccine schedule from DOB. FVRCP at 6-8, 10-12, 14-16 weeks; rabies at 16 weeks. AAFP 2020.Open calculator
- Cat Litter by HouseholdMonthly litter needs and cost for 1-6 cats across 6 litter types. Includes Humane Society n+1 box rule and type-specific recommendations.Try this tool
Aquarium & Fish Calculators
View all aquariums tools β- Aquarium Volume CalculatorAll-in-one aquarium calculator: volume in gallons, liters & UK gallons, water weight, recommended heater wattage, filter GPH and substrate.Open calculator
- Aquarium Gravel CalculatorCalculate exactly how much gravel or sand your aquarium needs by tank size and depth. Multi-substrate (gravel, sand, planted).Try this tool
- Aquarium Stocking CalculatorCheck if your aquarium is overstocked using the AqAdvisor-style bioload model with surface-area and filtration factors.Run the numbers
- Aquarium Heater CalculatorCalculate the right heater wattage for your aquarium based on tank size, target temperature and room temperature differential.Calculate now
- Aquarium Water Change CalculatorCalculate how many gallons of water to remove for a 10/25/50 % water change. Nitrate dilution calculator included.Use this calculator
- Pond Volume CalculatorCalculate pond volume in gallons and liters for rectangular, round, kidney-shaped and irregular ponds. Plus liner size and pump flow.Get instant result
- Aquarium CO2 CalculatorCalculate bubble rate (bps) and CO2 ppm for planted aquariums. Target 30 ppm for lush growth without harming fish.Open calculator
- Aquarium Salt CalculatorCalculate the exact amount of marine salt, brackish salt or aquarium tonic salt for your tank volume and target salinity (ppt or SG).Try this tool
- Aquarium PAR CalculatorCalculate the required light level (watts per gallon or PAR ΞΌmol/mΒ²/s) for planted aquariums. Low light, medium, high-tech tanks.Run the numbers
- Aquarium Fertilizer CalculatorCalculate weekly dry fertilizer doses (KNO3, KH2PO4, K2SO4, micros) for planted tanks using the Estimative Index method.Calculate now
- Goldfish Tank SizeHow big should a goldfish tank be? Correct sizing per fish: fancy goldfish (20 gal first + 10/extra), common goldfish (pond-only: 100+ gal).Use this calculator
- Betta Tank SizeWhat size tank does a betta need? Modern standard: 5 gallons minimum filtered and heated β NOT a bowl. With plants / sorority / community tank options.Get instant result
- Nitrogen Cycle TrackerTrack your aquarium cycle day-by-day. Logs ammonia, nitrite and nitrate progression. Ammonia dose calculator for fishless cycling.Open calculator
- Koi Pond StockingHow many koi for your pond? 250-500 gallons per adult koi (24-36 inches). Depth 4+ ft for winter.Try this tool
- Axolotl TankTank size for axolotls: 20 gal single, +10 gal each. Cold water 60-68Β°F, NO gravel (impaction risk).Run the numbers
- Fish Food CalculatorHow much to feed fish? 2-minute rule: only as much as eaten in 2 minutes. Species-specific 1-2% body weight.Calculate now
- Aquarium Cycling TimePredict days to complete the nitrogen cycle based on tank size, bacterial starter product, ammonia source and temperature. Full milestone timeline.Use this calculator
- Aquarium Carbon NeedsGrams of activated carbon for your tank by size, goal (maintenance / medication removal / tannin / odor) and water type.Get instant result
Horse Calculators
View all horses tools β- Horse Weight CalculatorEstimate horse weight using the heart-girth Γ body-length formula. Covers adults, foals, yearlings, ponies and draft horses.Open calculator
- Horse Pregnancy CalculatorCalculate your mare's foaling date with a breed-adjusted gestation (Thoroughbred 340d, Draft 345d). Trimester care calendar.Try this tool
- Horse Feed CalculatorCalculate daily hay and grain for your horse based on weight, activity level and feed type. 2 % rule plus workload adjustments.Run the numbers
- Horse Dewormer Dosage CalculatorCalculate the correct dewormer dose for horses by bodyweight. Supports ivermectin, moxidectin, fenbendazole and combination tube wormers.Calculate now
- Horse Blanket Size CalculatorCalculate your horse's blanket size. Standard US sizing = center of chest to point of buttock (inches), in 3-inch increments.Use this calculator
- Horse Bit Size CalculatorFind the correct bit size by measuring mouth width. Covers snaffles, Western bits, pony bits β standard US bit sizes in 1/4 inch increments.Get instant result
- Horse Age by TeethEstimate a horse's age by teeth β Galvayne's groove, cup wear, slope of incisors. Based on equine dental aging literature.Open calculator
- Thoroughbred FeedFeed calculator for Thoroughbred racehorses in training. Higher grain (2-3 lb per 100 lb BW) + quality forage + electrolyte support.Try this tool
Rabbit Calculators
View all rabbits tools β- Rabbit Pregnancy CalculatorCalculate your doe's kindling date (28β34 day gestation). Nest-box prep countdown and kit milestone tracker.Open calculator
- Rabbit Age CalculatorConvert rabbit age to human years with breed-size-adjusted lifespans for dwarf, standard and giant rabbits.Try this tool
- Rabbit Hutch Size CalculatorCalculate the minimum, recommended and ideal hutch size for 1β3 rabbits. RWA-standard dimensions with breed-size adjustment.Run the numbers
- Rabbit Feeding CalculatorCalculate daily hay (unlimited), pellet portions and fresh greens for your rabbit based on weight and life stage.Calculate now
- Rabbit Water IntakeCalculate daily water for rabbits: 50-150 mL per kg body weight.Use this calculator
Livestock Calculators
View all livestock tools β- Goat Pregnancy CalculatorEstimate your doe's kidding date using breed-adjusted 145β155 day gestation. Nubian, Boer, Nigerian Dwarf, Alpine, Saanen supported.Open calculator
- Cow Pregnancy CalculatorBreed-adjusted calving date calculator β Holstein 279d, Angus 281d, Hereford 285d, Jersey 283d. Trimester and calving prep.Try this tool
- Sheep Pregnancy CalculatorEstimate your ewe's lambing date using the 147-day gestation. Breed-adjusted for meat, wool and dairy sheep.Run the numbers
- Pig Pregnancy CalculatorCalculate your sow's farrowing date using the 114-day gestation ('3 months, 3 weeks, 3 days'). Farrowing prep milestones.Calculate now
- Cattle Weight CalculatorEstimate cattle weight using the heart-girth formula. Separate equations for beef, dairy and calves.Use this calculator
- Hay CalculatorCalculate how many bales and tons of hay you need for winter feeding. Works for cattle, horses, goats and sheep.Get instant result
- Stocking Rate CalculatorCalculate the correct stocking rate (animal units per acre) for cattle, sheep and goats based on forage production.Open calculator
- Goat Feed CalculatorCalculate daily hay, grain and mineral needs for meat, dairy and dwarf goats based on body weight and production stage.Try this tool
- Goat Dewormer CalculatorCalculate goat dewormer doses (fenbendazole, moxidectin, levamisole) by body weight, guided by FAMACHA score.Run the numbers
- Calf Milk ReplacerCalculate daily milk replacer for dairy or beef calves. 10% of body weight in whole milk equivalent; adjust for season and growth target.Calculate now
- Holstein Dry-Off CalculatorCalculate optimal dry-off date for Holstein dairy cows. 60-day dry period critical for mammary regeneration and next-lactation yield.Use this calculator
- Nigerian Dwarf KiddingNigerian Dwarf goat kidding date calculator. Shorter gestation than standard goats (145-153 days). Multiple kids common (2-5 per litter).Get instant result
- Boer Goat FeedFeed calculator for Boer meat goats. Higher protein (16-18%) for fast growth; creep feeding of kids starts at 2 weeks.Open calculator
- Angus FeedFeed calculator for Angus beef cattle: cow-calf, background, finishing phases. ADG targets 2-4 lb/day in finishing.Try this tool
Poultry Calculators
View all poultry tools β- Egg Incubation CalculatorCalculate hatch date for chicken (21d), duck (28d), quail (17d), turkey (28d), goose (28β35d) and more. Day-by-day development.Open calculator
- Chicken Coop Size CalculatorCalculate the minimum coop and run size for your flock. 4 sq ft indoor, 10 sq ft outdoor per hen (standard welfare guideline).Try this tool
- Chicken Feed CalculatorCalculate daily, monthly and yearly feed needs for your flock. Starter, grower, layer and broiler feed phases.Run the numbers
- Chicken Laying AgePredict when your pullet will start laying eggs. Typical range 16-24 weeks depending on breed (Leghorn earliest; Brahma latest).Calculate now
- Duck Feed CalculatorCalculate daily and monthly feed for ducks by age and purpose (layer, meat, pet). Starter, grower, layer phases with niacin supplement guidance.Use this calculator
Small Pet Calculators
View all small pets tools β- Hamster Age CalculatorConvert hamster age to human years for Syrian, Dwarf (Campbell/Winter White), Roborovski and Chinese hamsters β big lifespan differences.Open calculator
- Guinea Pig Cage CalculatorCalculate the minimum, preferred and ideal cage size for 1β4 guinea pigs. C&C grid count, gender-adjusted recommendations.Try this tool
- Hamster Cage Size CalculatorCalculate minimum hamster cage size by species. Syrian: 100Γ50 cm (600 sq in) minimum per German TVT. Most pet-store cages are too small.Run the numbers
- Gerbil Cage Size CalculatorCalculate correct cage size for gerbil pairs and groups. 10+ gallons floor space per gerbil with 6+ inches deep bedding for burrowing.Calculate now
Reptile Calculators
View all reptiles tools β- Bearded Dragon Tank CalculatorCalculate the correct tank size for your bearded dragon by age or length. 40-gal minimum for adults β covers baby, juvenile, adult stages.Open calculator
- Turtle Tank Size CalculatorCalculate the correct tank size for aquatic turtles (sliders, painted, musk) using the 10-gal-per-inch-of-shell rule.Try this tool
- Reptile UVB Distance CalculatorCalculate the correct distance from a UVB bulb for your reptile species (desert vs tropical) based on Ferguson zones.Run the numbers
- Leopard Gecko Tank CalculatorCalculate correct enclosure size for leopard geckos. Minimum 20 gal for adult; 30-40 gal recommended. Baby, juvenile, adult life-stages.Calculate now
- Ball Python Enclosure CalculatorCalculate correct enclosure size for ball pythons. Modern standards: 4Γ2Γ2 ft (120 gal equivalent) for adults β much larger than old tub advice.Use this calculator
- Crested Gecko EnclosureCorrect enclosure size for crested geckos. Minimum 18Γ18Γ24" for adults; vertical orientation for arboreal species. Hatchling to adult sizing.Get instant result
- Corn Snake EnclosureCalculate correct enclosure size for corn snakes by snake length. Modern standard: 4'Γ2'Γ2' (120 gal equivalent) for adults.Open calculator
- Chameleon EnclosureCorrect screen-cage size for veiled, panther and Jackson's chameleons. Minimum 2'Γ2'Γ4' for adults β vertical orientation, mesh sides for airflow.Try this tool
- Tortoise EnclosureEnclosure size for Russian, Greek, Sulcata, Red-foot tortoises. Sulcatas need 10Γ10 ft outdoor adult.Run the numbers
- Snake Prey SizeCorrect prey size for snakes: 1-1.5Γ the snake's girth at the widest point. Pinkie through jumbo rat sizing.Calculate now
- Reptile HumidityTarget humidity for 15+ reptile species: ball python 55-65%, crested gecko 60-80%, bearded dragon 30-40%.Use this calculator
- Bearded Dragon Calcium ScheduleGenerate a 7-day calcium and D3 dusting schedule for bearded dragons based on life stage, UVB quality and diet composition. MBD prevention.Get instant result
Bird Calculators
View all birds tools β- Bird Cage Size CalculatorCalculate minimum cage dimensions for parakeets, cockatiels, conures, amazons, macaws and more. Bar spacing recommendations included.Open calculator
- Parrot Age CalculatorConvert your parrot's age to human years and compare life stage. Supports 20+ species from budgie (8 yr) to macaw (60 yr).Try this tool
- Bird Seed MixDaily seed portion and recommended mix composition for cockatiels, budgies, parrots, finches and canaries. Converts grams to tablespoons.Run the numbers
- Bird Egg IncubationHatch date and key incubation milestones for pet and aviary birds: cockatiel 19d, budgie 18d, parrot 24-28d, canary 14d, finch 13d, Amazon 26d.Calculate now
- Aviary SizeMinimum aviary square footage for small, medium and large birds. Flight clearance, perch spacing and multi-species compatibility.Use this calculator
- Bird Age Multi-SpeciesConvert your bird's age to human years across 14 parrot, softbill and finch species. Life-stage labels for juvenile, adult, geriatric.Get instant result
- Bird Wing ClippingSpecies-specific wing clipping guide: how many primary feathers, symmetrical vs asymmetrical, safety walkthrough.Open calculator
Rat Calculators
View all rats tools β- Rat Cage SizeCalculate minimum cage size for pet rats. RSPCA standard: 2 cubic feet per rat with multi-level setup. Popular Critter Nation / Double Critter Nation sizing.Open calculator
- Rat AgeConvert rat age to human years. Lifespan 2-3 years β a 6-month-old rat is already a young adult (~17 human years).Try this tool
- Rat FeedingDaily feeding amounts for pet rats: 15-20g lab blocks + fresh vegetables per rat. Oxbow Essentials, Mazuri, Harlan Teklad formulations.Run the numbers
- Rat Group SizeRats are social and MUST live in groups. Calculate minimum group size and same-sex pairing rules.Calculate now
Ferret Calculators
View all ferrets tools β- Ferret Cage SizeCalculate minimum cage size for pet ferrets. AFA standard: 24Γ24Γ18 min, 4Γ4Γ2 ft multi-level ideal. Popular Ferret Nation cages.Open calculator
- Ferret FoodFerrets are obligate carnivores. Daily portion: 5-7% body weight of high-protein kibble (35-40% protein, 20% fat).Try this tool
- Ferret AgeConvert ferret age to human years. Ferrets live 5-9 years; aging accelerates after year 4. Adrenal disease common in seniors.Run the numbers
- Ferret Vaccine ScheduleGenerate ferret vaccine schedule from date of birth. Core: distemper (3 doses) + rabies annually.Calculate now
Exotic Pet Calculators
View all exotic pets tools β- Hedgehog CageMinimum cage size for hedgehogs: 4 sq ft (24Γ36). Temperature MUST be 70-85Β°F.Open calculator
- Chinchilla CageMinimum cage for chinchillas: 3Γ2Γ4 ft tall, multi-level. No plastic. Temperature 60-70Β°F max.Try this tool
- Sugar Glider CageMinimum cage for sugar glider pairs: 36Γ24Γ36 vertical. Bar spacing max 1/2 inch.Run the numbers
- Tarantula EnclosureCalculate correct enclosure size for tarantulas: 3Γ diagonal leg span Γ 2Γ leg span.Calculate now
- Potbelly Pig FeedFeed calculator for pet potbelly and mini pigs. 1-2% body weight in specialty pig pellets.Use this calculator
Science-backed
Every formula cites its original source β AKC, Merck Veterinary Manual, AAFCO/NRC, and peer-reviewed studies like the UCSD 2020 epigenetic-clock paper.
Vet-reviewed
Health and nutrition tools are reviewed by licensed veterinarians (DVM). Disclaimers are prominent and do not gate the calculator.
Privacy-first
No accounts, no tracking, no data stored on our servers. Your petβs details never leave your device.
Key terms used across our calculators
A short glossary of the abbreviations and concepts youβll see in result explanations. For the full list, see our glossary of pet calculator terms.
- RER (Resting Energy Requirement)
- The baseline daily calories a pet needs at rest. Computed as RER = 70 Γ weight_kg0.75. Most calorie calculators start here and multiply by an activity / life-stage factor.
- MER (Maintenance Energy Requirement)
- The total daily calories a pet needs to maintain weight at its current activity level. MER = RER Γ activity factor (typically 1.2β8.0).
- BCS (Body Condition Score)
- A 1β9 scale used by veterinarians to assess whether a pet is underweight (1β3), ideal (4β5), or overweight (6β9). Many of our weight tools recommend BCS-based adjustments.
- YMYL (Your Money or Your Life)
- Googleβs classification for content that can affect health, safety or finances. On FurCalc, all toxicity, drug-dose and insulin tools are YMYL and carry additional DVM review.
- AAFCO profile
- The nutrient profile a pet food must meet to be labeled βcomplete and balancedβ in the United States. Our nutrition calculators reference AAFCO minimums for protein, fat and key micronutrients.
Sources we cite
FurCalc formulas are drawn from primary sources β not aggregator sites. The references below cover roughly 90% of the equations used across our calculators. Per-tool sources are linked under each calculatorβs result.
- Merck Veterinary Manual β drug doses, toxic-dose thresholds, life-stage care.
- American Kennel Club (AKC) β breed standards & growth charts.
- AAHA practice guidelines β life-stage, nutritional assessment, vaccination, weight management.
- American Veterinary Medical Association (AVMA) pet-owner resources β disease prevention, household hazards.
- ASPCA Animal Poison Control β toxicity database referenced by our chocolate, grape, xylitol and onion calculators.
- NRC β Nutrient Requirements of Dogs and Cats (2006) β the canonical RER, MER and nutrient-minimum equations.
- U.S. Department of Agriculture (USDA) β animal welfare & livestock standards β referenced by our poultry, cattle and livestock husbandry calculators.
- NIH / NLM β Wang et al. (2020), βQuantitative Translation of Dog-to-Human Aging by Conserved Remodeling of the DNA Methylomeβ β the UCSD epigenetic-clock paper our Dog Age Calculator implements.
Calculator vs generic chart: why precision matters
Pet-care charts (cup-per-pound feeding charts, breed-age tables, tank-size rules of thumb) are convenient but lose accuracy at the edges. A calculator runs the same published formula a vet uses, with your petβs exact inputs.
| Aspect | Generic chart | FurCalc calculator |
|---|---|---|
| Input granularity | Weight bracket (5β10 lb, 10β20 lbβ¦) | Exact weight to 0.1 lb / 0.05 kg |
| Life-stage adjustment | One value per bracket | Puppy / adult / senior / pregnant / lactating factor |
| Activity adjustment | Rarely included | Activity multiplier 1.2 to 8.0 (AAHA / NRC factor) |
| Brand / food-specific | Chart of one fixed brand | Plug in your foodβs kcal/cup directly |
| Shows the math | No β just a final number | Yes β formula, intermediate values, source citation |
| Best for | Quick rough estimate | Daily portion control, medical dosing, BCS management |
In-depth guides and topic hubs
Each guide collects 10-30 cluster articles around one core topic β read the pillar first if you want the framework, then dive into a specific calculator.
- Pet care articles & deep-dive guides
Longform pillar guides on nutrition, life-stage care, toxicity, and breed-specific concerns β each linked to the matching calculator.
- Glossary of pet calculator & veterinary terms
Plain-English definitions of RER, MER, BCS, AAFCO, AAHA, MERC index and every other shorthand we use in results.
- Compare breeds, foods & products
Side-by-side breed lifespan, food calorie density and tank stocking comparisons β clusters that link back to each species calculator.
- All FurCalc calculators (full index)
The complete A-to-Z directory of every calculator, grouped by species and by use case (nutrition, age, dosing, environment).
Featured cluster articles
Hand-picked deep-dive guides β each pairs with a calculator above and pulls together the science, the formula and the practical workflow.
- The science behind dog years to human years (epigenetic clock explained)
- Is chocolate bad for dogs? Toxic-dose thresholds & emergency response
- How much water should a dog drink daily? Body-weight formula & warning signs
- The complete puppy first-year guide: weight chart, vaccinations & feeding
- Helping an overweight dog lose weight safely: calorie deficit & BCS workflow
- Raw feeding for dogs β BARF & PMR ratios with calorie targets
- Cat diabetes playbook: insulin dosing, monitoring & remission strategy
- Senior cat care: nutrition, weight management & hydration after age 10
- Kitten weight chart by week β what healthy growth looks like (0-16 weeks)
- Beginner aquarium setup: tank size, stocking density & cycling timeline
- Bearded dragon setup for beginners: enclosure size, UVB & temperature gradient
- See all FurCalc deep-dive articles β
Frequently asked questions
Who builds and reviews the calculators on FurCalc?
Every formula is implemented by the FurCalc Editorial Team β writers and researchers with backgrounds in veterinary technology and scientific writing. Health-impact (YMYL) tools like toxicity screeners, drug-dose calculators and insulin tools are additionally reviewed by licensed Doctors of Veterinary Medicine (DVM) before publishing.
Are FurCalc results accurate enough to make decisions for my pet?
Our calculators implement the exact published formulas β AAFCO/NRC nutrition equations, AAHA/AAFP life-stage charts, the UCSD 2020 epigenetic dog-age formula, and peer-reviewed husbandry research. Results are accurate within the precision of your inputs. For toxicity, drug-dose and insulin calculations, always confirm with your vet β calculators are educational, not clinical devices.
Do I need to create an account or pay for the calculators?
No. All FurCalc tools are free, require no account, and run entirely in your browser. We do not store your pet's details on any server β calculations happen client-side. You can bookmark, share or use any calculator offline once the page has loaded.
What is the difference between a pet age calculator and a life expectancy calculator?
An age calculator converts chronological pet age into a comparable human-equivalent age using species-specific aging curves (dogs age fastest in their first 2 years, then slow). A life expectancy calculator estimates remaining lifespan based on breed size, weight, neutering status and known longevity statistics. Use age for context, life expectancy for planning senior-pet care.
How is a dog calorie calculator different from a generic pet food chart?
A pet food chart gives one cup-count per weight bracket. A calorie calculator uses the Resting Energy Requirement formula (RER = 70 Γ weight_kg^0.75) multiplied by an activity factor (1.2 for spayed adult, up to 8.0 for nursing mothers), then divides by your specific food's kcal/cup to give an exact daily portion. The calculator adapts to life stage, body condition and food brand β a chart cannot.
Which FurCalc calculator should I use for an emergency, like chocolate ingestion?
For acute toxicity (chocolate, grapes, xylitol, medications), use a dedicated toxicity calculator and call your vet or the ASPCA Animal Poison Control Center (888-426-4435) immediately. Toxicity tools estimate the toxic-dose threshold from species, weight and substance amount β they are decision support, not a substitute for veterinary care. Time-to-treatment is the single biggest factor in outcome.
Can I embed a FurCalc calculator on my vet clinic or pet blog?
Yes. Every calculator page has an Embed button that generates an iframe snippet. The iframe loads only the calculator (no FurCalc header or footer) and works on WordPress, Squarespace, Webflow, Ghost and any CMS. The only requirement is keeping the small 'Powered by FurCalc' attribution link intact.
About the author and editorial review
FurCalc is written and maintained by the FurCalc Editorial Team β read the full author bio, a small group of writers and researchers with backgrounds in veterinary technology, animal husbandry and scientific writing. Health-impact tools (toxicity, drug dosing, insulin) carry an additional review by a licensed DVM before publication.
For our editorial standards, source-citation rules and correction policy, see the FurCalc editorial policy. For our position on advertising and affiliate links, see the affiliate disclosure.